Systems and Methods to Control Lithium Plating
Various battery cell arrangements are presented herein. The battery cell can include an anode current collector. The battery cell can include an anode coating layer that coats the anode current collector. The anode coating layer may be a lithium-ion conducting solid state electrolyte or a lithium-ion conducting gel electrolyte. A first bond between the anode current collector and the anode coating layer may have a first adhesion strength. The battery cell also includes a cathode, a separator layer that contacts the cathode, and a separator coating layer. The separator coating layer can be positioned between the anode coating layer and the separator layer. A second bond between the separator coating material and the anode coating material has a second adhesion strength. The second adhesion strength of the second bond may be greater than the first adhesion strength of the first bond.
1 . A battery cell, comprising:
an anode current collector;
an anode coating layer that coats the anode current collector, wherein:
the anode coating layer is selected from the group consisting of: a lithium-ion conducting solid state electrolyte; and a lithium-ion conducting gel electrolyte; and
a first bond between the anode current collector and the anode coating layer has a first adhesion strength;
a cathode;
a separator layer that contacts the cathode;
a separator coating layer wherein the separator coating layer is positioned between the anode coating layer and the separator layer, wherein:
a second bond between the separator coating layer and the anode coating layer has a second adhesion strength; and
the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.
2 . The battery cell of claim 1 , wherein a peel test is used to determine that the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.
3 . The battery cell of claim 2 , wherein the peel test is a 180 degree peel test.
4 . The battery cell of claim 1 , wherein the separator coating comprises polyvinylidene fluoride (PVDF).
5 . The battery cell of claim 1 , wherein heat and pressure is applied to the battery cell to increase adhesion between the separator coating and the anode coating layer.
6 . The battery cell of claim 5 , further comprising lithium plating located between the anode current collector and the anode coating layer.
7 . The battery cell of claim 6 , wherein no lithium plating is present between the anode coating layer and the separator coating layer.
8 . The battery cell of claim 1 , wherein the anode coating layer is the lithium-ion conducting solid state electrolyte.
9 . The battery cell of claim 1 , wherein the anode coating layer is the lithium-ion conducting gel electrolyte.
10 . A method of creating a battery cell, the method comprising:
coating an anode current collector with an anode coating layer, wherein:
the anode coating layer is selected from the group consisting of: a lithium-ion conducting solid state electrolyte; and a lithium-ion conducting gel electrolyte; and
a first bond between the anode current collector and the anode coating layer has a first adhesion strength;
coating a separator with a separator coating layer;
pressing the anode current collector toward the separator such that the anode coating layer is pressed against the separator coating layer;
applying heat while the anode current collector is being pressed against the separator such that the anode coating layer is pressed against the separator coating layer, wherein
a second bond between the separator coating layer and the anode coating layer having a second adhesion strength is present; and
the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.
11 . The method of creating the battery cell of claim 10 , further comprising:
performing a peel test to determine that the second adhesion strength of the second bond is greater than the first adhesion strength of the first bond.
12 . The method of creating the battery cell of claim 11 , wherein the peel test is a 180 degree peel test.
13 . The method of creating the battery cell of claim 10 , wherein the separator comprises polyvinylidene fluoride (PVDF).
14 . The method of creating the battery cell of claim 10 , wherein lithium plating is located between the anode current collector and the anode coating layer.
15 . The method of creating the battery cell of claim 14 , wherein no lithium plating is present between the anode coating layer and the separator coating layer.
16 . The method of creating the battery cell of claim 10 , wherein coating the separator with the separator coating layer comprises coating the separator with a PVdF slurry that comprises NMP (N-methylpyrrolidone).
17 . The method of creating the battery cell of claim 10 , wherein pressing the anode current collector toward the separator comprises applying a pressure between 50 and 200 N/cm2.
18 . The method of creating the battery cell of claim 10 , wherein the anode coating layer is the lithium-ion conducting solid state electrolyte.
19 . The method of creating the battery cell of claim 10 , wherein the anode coating layer is the lithium-ion conducting gel electrolyte.
20 . The battery cell of claim 5 , wherein the temperature of the applied heat is between 75 and 100 Celsius and the pressure applied is between 50-200 N/cm 2 .